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USGS Daily Statistics for Illinois

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The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 05525000 IROQUOIS RIVER AT IROQUOIS, IL


Iroquois County, Illinois
Hydrologic Unit Code 07120002
Latitude  40°49'23", Longitude  87°34'54" NAD83
Drainage area 686  square miles
Gage datum 614.13 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1944-10-01 -> 2024-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 830 704 1,040 1,140 1,100 873 732 208 185 207 279 531
2 798 698 1,000 1,140 1,090 875 681 187 199 205 298 529
3 800 686 981 1,140 1,050 854 650 181 202 205 320 529
4 808 680 1,010 1,170 987 786 616 177 187 222 319 519
5 815 723 1,100 1,160 932 754 582 170 174 216 313 507
6 817 743 1,100 1,150 864 770 535 178 167 211 311 493
7 798 712 1,070 1,140 826 779 489 190 164 208 298 492
8 791 674 1,060 1,100 820 792 482 197 158 203 280 503
9 781 673 1,080 1,060 816 820 562 183 162 206 265 495
10 740 717 1,110 1,020 822 845 604 179 171 214 253 483
11 722 726 1,180 1,020 828 855 615 171 177 223 262 487
12 724 734 1,180 1,060 859 872 638 160 179 241 279 520
13 738 735 1,170 1,070 923 947 661 159 182 240 283 533
14 743 749 1,180 1,070 968 976 677 154 217 241 293 523
15 723 777 1,160 1,080 980 1,000 652 142 256 240 315 557
16 707 776 1,140 1,080 979 988 591 136 257 245 337 588
17 663 818 1,110 1,080 980 949 525 138 245 277 367 577
18 630 872 1,100 1,060 977 916 488 149 234 305 386 554
19 617 916 1,130 1,040 960 880 468 161 225 304 419 528
20 612 940 1,160 1,040 935 848 461 177 209 294 436 501
21 613 1,070 1,160 1,030 909 815 465 185 194 282 434 503
22 624 1,140 1,130 1,010 867 784 483 183 191 286 422 561
23 653 1,180 1,090 1,010 838 755 468 180 198 302 420 587
24 709 1,220 1,070 987 801 731 446 162 207 335 432 595
25 715 1,190 1,030 988 778 720 418 149 206 355 427 623
26 706 1,120 1,030 987 789 720 381 155 202 366 433 634
27 703 1,080 1,030 999 791 731 346 154 198 363 452 653
28 713 1,080 1,080 1,020 801 794 317 149 205 347 484 679
29 712 657 1,110 1,030 813 787 278 160 212 324 507 743
30 722   1,120 1,060 822 761 249 168 208 303 525 791
31 723   1,120   861   235 165   292   834